3 Wire Circuit
3 Wire Circuit -
Connecting 2 and 3wire Systems IN the February 1 issue a correspondent asked if it was possible to feed his 2wire system from the 3wire My impression from past experience is that it is a 3wire lighting circuit and a 2—wire motor \ s!8500 VA x l.25 = l0,625 VA l0,625 VA r 240 V = 44 A for 3wire, l20/240 V The lighting load would be permitted to be served by 2 wire or 3wire. l5 or 20A circuits with combined capacity equal to 44 A or greater for 3wire circuits or 88 A or TABLE VIII GENERALPURPOSE CIRCUITS (A) Using 15amp (No 14 wire) circuits: AMPS. 10 37.5 No of circuits = 10 (B) Using 20amp (No 12 wire) circuits: AMPS. 15 37.5 15 No of circuits= = 3.75 or 4 circuits = 2.5 or 3 circuits APPLIANCE December 1, 1916 995 N THE early
days.of the electrical industry singlephase circuits were used for the distribution of THREEPHASE 3WIRE CIRCUIT Assume, for instance, a case where 200 kw. at 80 per cent powerfactor, alternating Since the voltage of the fourwire circuit is 4000 volts instead of 2300, less copper is required to transmit a given Editor Electrical Engineering: The 3 wire 3 phase circuit may be used with either the D or Y connections, but the 4 wire 3 phase Those switches to which the current transformers are connected should be designed to close the circuit on one side MEASURING POWER IN A 3PHASE 3WIRE CIRCUIT WITH 2 SINGLEPHASE WATTMETERS AND CURRENT AND Those switches to which the current transformers are connected should be designed to
close.the circuit on one side MEASURING POWER IN A 3PHASE 3WIRE CIRCUIT WITH 2 SINGLEPHASE WATTMETERS AND CURRENT AND 5 Amp. 10 Amp. '5 Amp. 2 Wire 2 Wire 3 Wire Total Number in service. 1,401,568 206,284 194.201 Watts per circuit — 660 in all cases, with the exception of 1750 and 11320* Hovv many circuits do you allow? — (See Table III.) Per cent of The minimum branchcircuit rating for an electric range rated 8 kW or more is 40 amperes [210.19(A)(3)]. Reduced Neutral Conductor The neutral conductor of a 120/240volt, singlephase, 3wire branch circuit supplying an electric range, Watts amps watt. | wal | –– Ammeter . . . . . . . . . . . . Induction 6' 3 6' 0 3 1 | 30 || – – Ammeter . circuits;
and.(6) threephase, 3wire circuits. The use of singlephase wattmeters in threephase, 3wire circuits is specially considered.
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